CN2936561Y

CN2936561Y - Electric tool

Info

Publication number: CN2936561Y
Application number: CN 200620130753
Authority: CN
Inventors: 张士松
Original assignee: Positec Power Tools Suzhou Co Ltd
Current assignee: Positec Power Tools Suzhou Co Ltd
Priority date: 2006-07-28
Filing date: 2006-07-28
Publication date: 2007-08-22
Anticipated expiration: 2016-07-28

Abstract

The utility model relates to an electric tool, which comprises a casing, an motor, a transmission shaft matched with the motor, a guide sleeve, a reciprocating lever and a back balance; wherein, the transmission shaft is provided with a first pendulum component used to drive the reciprocating lever to do a reciprocating rectilinear motion and a second pendulum component used to drive the back balance to do a reciprocating swing. The back balance connected with a pivot of the casing is driven to do the reciprocating swing against the pivot under the driving of the second pendulum component. The swing track of the back balance is intersected with the rectilinear motion track of the reciprocating lever. For the back balance is connected within the casing with the pivot, no friction with a long travel and a large area and no constraint relation are available between the back balance and the guide sleeve, so that the stability of the system is effectively promoted. In addition, the fitting surface of the back balance can be processed relatively simple and the cost is reduced.

Description

Electric tool

Technical field

The utility model relates to a kind of electric tool, especially a kind of fork reciprocating saw with balance weight.

Background technology

Traditional fork reciprocating saw has a fairlead, and one is sheathed on reciprocating lever in the fairlead and first oscillating bar assembly that drives described reciprocating lever, and second oscillating bar assembly that is set in the balance weight on the fairlead and drives described balance weight.United States Patent (USP) bulletin patent has just disclosed a kind of fork reciprocating saw No. 5025562, the balance weight of described fork reciprocating saw is arranged on the fairlead, reciprocating lever is arranged in the fairlead, described balance weight and described reciprocating lever movement locus parallel or overlap.The set-up mode of this kind balance weight and fairlead, mating surface is many, and friction area is big, concerns complexity between each movement parts.In addition,, make to assemble complexity by fitted position required precision height, cause manufacturing cost than higher owing to balance weight, fairlead need accurately machined mating surface too much.

The utility model content

For overcoming the deficiency of existing fork reciprocating saw balance weight and fairlead set-up mode, the purpose of this utility model is to provide a kind of fork reciprocating saw with the balance weight that can be pivoted and not be subjected to the fairlead constraint.

The technical scheme that its technical problem that solves the utility model adopts is: a kind of electric tool, comprise that housing is arranged at the motor in the described housing, the power transmission shaft that connects with described motor, reciprocating lever and balance weight, also be provided with second oscillating bar assembly that is used to drive first oscillating bar assembly of described reciprocating lever linear reciprocating motion and is used to drive described balance weight motion on the wherein said power transmission shaft, it is characterized in that: described balance weight and described housing are pivotally connected, under the driving of described second oscillating bar assembly, described balance weight is with respect to described pivot reciprocally swinging, and then makes the swinging track of described balance weight and the straight-line trajectory of described reciprocating lever intersect.

Wherein, described electric tool also includes and is sheathed on the outer fairlead of described reciprocating lever; Described reciprocating lever comprises reciprocal rod tube that connects saw blade and the reciprocating lever tail that connects with described reciprocal rod tube; Described fairlead is provided with first groove along the fairlead longitudinal extension, and described reciprocating lever tail correspondence is formed with a protuberance, described protuberance can be in described first groove along the longitudinal sliding motion of reciprocating lever; Described fairlead is provided with second groove along the fairlead longitudinal extension, described reciprocating lever tail is provided with first hole and second hole, described first oscillating bar assembly comprises first swing arm, and described first swing arm is housed in described first hole by described second groove and second hole; Described balance weight comprises a U type groove, and described fairlead is contained in the described U type groove; Described balance weight comprises the resettlement section of accommodating described second oscillating bar assembly.Described balance weight is provided with and is used for rotating the bearing pin that connects with described housing, and under the driving of described second oscillating bar assembly, described balance weight can be pivoted with respect to described housing; Be 0 angle setting between described first oscillating bar assembly and described second oscillating bar assembly.

Compared with prior art, the beneficial effects of the utility model are: owing to adopted pivotally connected balance weight in housing, between balance weight and the fairlead, there is not the large-area friction of big stroke, and not having restriction relation between balance weight and the fairlead, the motion of balance weight is independent separately with the motion that is arranged on the reciprocating lever in the fairlead, has effectively improved the stability of system, and the processing of the mating surface of balance weight is simpler, has reduced cost.

Description of drawings

The utility model is described in further detail below in conjunction with the drawings and specific embodiments.

Fig. 1 is the partial sectional view of the utility model fork reciprocating saw, and second oscillating bar assembly that drives first oscillating bar assembly of reciprocating lever and driven equilibrium piece this moment is at first extreme position of stroke separately.

Fig. 2 is the utility model fork reciprocating saw phantom, second oscillating bar assembly that drives first oscillating bar assembly of reciprocating lever and driven equilibrium piece this moment stroke separately second extreme position.

Fig. 3 be along first, second oscillating bar assembly among Fig. 1 along perpendicular to the drive shaft axis direction sectional view.

Fig. 4 is the stereogram of the reciprocal balance weight of the utility model fork reciprocating saw.

Fig. 5 is the stereogram of the balance weight of the utility model fork reciprocating saw.

The reciprocal balance weight of Fig. 6 the utility model is positioned at the schematic diagram of first extreme position.

Schematic diagram during a certain position of the reciprocal balance weight of Fig. 7 the utility model between first limit and second extreme position.

The reciprocal balance weight of Fig. 8 the utility model is positioned at the schematic diagram of second extreme position.

Wherein: 1. 813. second holes, 73. first bearing pin 74. second bearing pins, 75. accepting hole 8. reciprocating levers, 81. reciprocating lever tail 811. protuberances, 812. first holes, 62. second bearing 7. balance weight 71.U type grooves, 72. resettlement sections, 52. clutch shaft bearings, 6. second oscillating bar assembly 61. second swing arms, 611. second swing arm ends, housing 2. motors, 3. saw blade 4. power transmission shafts, 5. first oscillating bar assembly 51. first swing arms, 511. first swing arm end, 82. reciprocal rod tube 9. fairleads 91. first grooves 92. second grooves 10. driving elements

The specific embodiment

The utilization fork realizes that reciprocating mechanism can be applied in a lot of instruments, and wherein a fork drives reciprocating lever, and another fork driven equilibrium piece.Below be that swing-bar mechanism is applied to the embodiment in the reciprocating saw.

Referring to Fig. 1 and Fig. 2, a kind of reciprocating saw, the power transmission shaft 4, fairlead 9, reciprocating lever 8 and the balance weight 7 that comprise housing 1, motor 2, connect with described motor 2, one driving element 10 connects on described power transmission shaft 4, also is provided with on the wherein said driving element 10 to be used to drive described reciprocating lever 8 reciprocating first oscillating bar assemblies 5 and to be used to drive the second reciprocating oscillating bar assembly 6 of described balance weight 7.

Described first oscillating bar assembly 5 comprises clutch shaft bearing 52 that connects on driving element 10 and first swing arm 51 that connects with described clutch shaft bearing 52, and the end 511 of described first swing arm is spherical.Described second oscillating bar assembly 6 comprises second bearing 62 that connects on driving element 10 and second swing arm 61 that connects with described second bearing 62, and the end 611 of described second swing arm is spherical.Described first oscillating bar assembly 5 and second oscillating bar assembly 6 are 180 degree phase place settings.

Further referring to Fig. 3 and Fig. 4,, can obtain to match well the bigger stroke of contact so be in the barycenter of the balance weight 7 of the some far-end that second swing arm 61 and balance weight 7 connect because the balance weight 7 that second oscillating bar assembly 6 drives is a swing mechanism.So obtain same balance weight stroke, the length of second swing arm 61 of the utility model the inside is shorter than preceding case.Referring to Fig. 2, i.e. first swing arm 51 and second swing arm 61 can not collided when moving to second extreme position mutually, so from the axis direction of reciprocating lever 8, be 0 angle setting between described first swing arm 51 and described second swing arm 61.

Referring to Fig. 1 and Fig. 2, described fairlead 9 is arranged in the housing 1, and it is provided with along first groove 91 of fairlead 9 longitudinal extensions and second groove 92.Described reciprocating lever 8 is sheathed in the described fairlead 9 slidably.Described reciprocating lever 8 comprises reciprocal rod tube 82 that connects saw blade 3 and the reciprocating lever tail 81 that fixedly connects with described reciprocal rod tube 82.The part of described reciprocating lever tail 81 corresponding first grooves 91 forms a protuberance 811, described protuberance 811 can be in described first groove 91 along the longitudinal sliding motion of reciprocating lever 8; Also be provided with first hole 812 and second hole 813 on the described reciprocating lever tail 81, the end 511 of described first swing arm 51 is housed in first hole 812 that is arranged on the described reciprocating lever 8 by second hole 813 that is arranged at second groove 92 on the fairlead 9 and be arranged on the described reciprocating lever 8.

Further referring to Fig. 4 and Fig. 5, described balance weight 7 comprises that a U type groove 71 and accommodates the resettlement section 72 of described second oscillating bar assembly 6, and described fairlead 9 is contained in the described U type groove 71.The bottom of described U type groove 71 forms an accepting hole 75 that is used to accommodate the described second swing arm end 611, described U type trench bottom has connected a resettlement section 72, be formed with first bearing pin 73 and second bearing pin 74 that connects with described housing 1 rotation in the bottom of described resettlement section 72, thereby under the driving of described second swing arm 61, described balance weight 7 can be pivoted with respect to described housing 1.In addition, first bearing pin 73 and second bearing pin 74 also can be arranged on the housing 1, corresponding fit structure is set on the balance weight 7 can realizes that equally the balance weight 7 and the pivot of housing 1 connect.

During work, motor 2 drives described power transmission shaft 4 and rotates, and fixedly connects the rotation of the driving element 10 on described power transmission shaft 4 thereby drive, thereby drives first oscillating

bar assembly

5 and 6 motions of second oscillating bar assembly.When described first swing arm 51 is rocked to the described position of Fig. 1, second swing arm 61 and balance weight 7 move along the direction opposite with the swaying direction of first swing arm 51, at this moment, first oscillating bar assembly 5 with and the reciprocating lever 8 that drives and second oscillating bar assembly 6 with and the balance weight 7 that drives be in first extreme position of stroke separately; When described first swing arm 51 is rocked to position shown in Figure 2 by position shown in Figure 1, second swing arm 61 and balance weight 7 move along the direction opposite with the swaying direction of first swing arm 51, described second swing arm 61 just is rocked in the U type groove of described balance weight 7, referring to Fig. 4, at this moment, first oscillating bar assembly 5 with and the reciprocating lever 8 that drives and second oscillating bar assembly 6 with and the balance weight 7 that drives be in second extreme position of stroke separately.

Referring to Fig. 6, Fig. 7 and Fig. 8, can clearly be seen that, when described power transmission shaft 4 rotates half-turn under motor 2 drives, the movement travel of described first driven unit 5 and reciprocating lever 8, the second driven units 6 that drive thereof and the balance weight 7 that drives thereof from separately first extreme position to second extreme position.

In addition, in order to reduce the vibrations that produced when reciprocating saw moves back and forth, when design, the weight and the stroke of the weight of described second swing arm 61 and balance weight 7 and stroke and described first swing arm 51, reciprocating lever 8 and saw blade 11 match.

The utility model adopts pivotally connected balance weight 7 in housing 1, fairlead 9 is contained in the U type groove of described balance weight 7, balance weight 7 can move back and forth with respect to described fairlead 9, between balance weight 7 and the fairlead 9, there is not the large-area friction of big stroke, and there is not restriction relation between balance weight 7 and the fairlead 9, the motion of balance weight 7 is independent separately with the motion that is arranged on the reciprocating lever 8 in the fairlead 9, effectively improved the stability of system, and the mating surface of balance weight 7 and fairlead 9 is partly processed simpler, has reduced cost.

Claims

1. electric tool, comprise housing (1), be arranged at the motor (2) in the described housing (1), the power transmission shaft (4) that connects with described motor (2), reciprocating lever (8) and balance weight (7), also be provided with second oscillating bar assembly (6) that is used to drive first oscillating bar assembly (5) of described reciprocating lever (8) linear reciprocating motion and is used to drive described balance weight (7) motion on the wherein said power transmission shaft (4), it is characterized in that: described balance weight (7) is pivotally connected with described housing (1), under the driving of described second oscillating bar assembly (6), described balance weight (7) is with respect to described pivot reciprocally swinging, and then makes the swinging track of described balance weight (7) and the straight-line trajectory of described reciprocating lever (8) intersect.

2. a kind of electric tool according to claim 1 is characterized in that: it also includes and is sheathed on the outer fairlead (9) of described reciprocating lever (8).

3. a kind of electric tool according to claim 2 is characterized in that: described reciprocating lever (8) comprises reciprocal rod tube (82) that connects saw blade (3) and the reciprocating lever tail (81) that connects with described reciprocal rod tube (82).

4. a kind of electric tool according to claim 3, it is characterized in that: described fairlead (9) is provided with along first groove (91) of fairlead (9) longitudinal extension, described reciprocating lever tail (81) correspondence is formed with a protuberance (811), described protuberance (811) can be in described first groove (91) along the longitudinal sliding motion of reciprocating lever (8).

5. a kind of electric tool according to claim 3, it is characterized in that: described fairlead (9) is provided with along second groove (92) of fairlead (9) longitudinal extension, described reciprocating lever tail (81) is provided with first hole (812) and second hole (813), described first oscillating bar assembly (5) comprises first swing arm (51), and described first swing arm (51) is housed in described first hole (812) by described second groove (92) and second hole (813).

6. a kind of electric tool according to claim 2 is characterized in that: described balance weight (7) comprises a U type groove (71), and described fairlead (9) is contained in the described U type groove (71).

7. a kind of electric tool according to claim 1 is characterized in that: described balance weight (7) comprises the resettlement section (72) of accommodating described second oscillating bar assembly (6).

8. a kind of electric tool according to claim 1, it is characterized in that: described balance weight (7) is provided with and is used for rotating the bearing pin (73,74) that connects with described housing, under the driving of described second oscillating bar assembly (6), described balance weight (7) can be pivoted with respect to described housing (1).

9. a kind of electric tool according to claim 1 is characterized in that: be 0 angle setting between described first oscillating bar assembly (5) and described second oscillating bar assembly (6).